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      Viber Delivery Reports

      You will receive a delivery report for every Viber message you send.

      Below is a breakdown of the possible delivery statuses and what each one means:

      1. Not Sent

      The Viber message failed to reach the recipient.

      • No Credits (Account): The account does not have enough balance to send messages.

      • Invalid MSISDN: The phone number is not valid.

      • Invalid URL: The URL included in the message is not valid.

      • Restricted SMS (Anti-SPAM): An anti-spam filter was triggered, which prevents sending the same message multiple times to the same recipient within a short time frame.

      2. Failed

      The Viber message was not delivered due to one of the following reasons:

      • Unknown User:

        • The recipient does not have the Viber app installed.

        • The recipient has opted not to receive messages from businesses.

        • The recipient has blocked the specific Viber Sender ID.
          These last two settings can be managed by the user in the Viber application.

      • SMS Failover (IM Unknown User):
        In Viber campaigns with SMS failover enabled, this status means the recipient could not receive the Viber message (due to one of the reasons above), and the message was instead sent via SMS.

      3. Succeeded

      The message was delivered successfully.

      • Delivered:
        The message has been successfully delivered to the recipient’s device.

        Note: Users can disable the "Seen" status in their Viber settings, so a message may remain in the "Delivered" state even if it has been read.

      • Seen:
        The recipient has received and seen the message.
        The ‘Seen’ status is triggered in any of the following scenarios:

        1. The user opens the business chat and views the message.

        2. The user enters the business inbox and sees the unread message preview (without opening the chat itself).

        3. The user receives a push notification while actively using the Viber app and views the message preview from the notification.

          This excludes impressions from push notifications displayed on the lock screen or in other apps.

      4. Undelivered

      The message failed to reach the destination.

      • Expired:
        The allowed delivery window expired before the message could be delivered.

      • Sent:
        The message has been sent, but delivery is still pending. This may occur if the recipient’s device is turned off or offline. The provider will continue trying to deliver the message.